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    • 5. 发明专利
    • PRIVATE WIRE COMMUNICATION EQUIPMENT
    • JPH02268550A
    • 1990-11-02
    • JP9038489
    • 1989-04-10
    • ISHII HIDEO
    • ISHII HIDEO
    • H04M9/00H04M9/02
    • PURPOSE:To evade the number of line cables from being increased to a large number by connecting a master and a large number of slaves in parallel, providing a display means at each slave, and performing wiring so as to display the separation of the transmitter/receiver of the master from a main body by the display means of the slaves simultaneously. CONSTITUTION:At private wire communication equipment connecting the master 10 having, the transmitter/receiver to a large number of slaves 20, 30 with wires, the master 10 is connected in parallel with the slaves 20, 30, and the display means 29, 39 are provided at the slaves 20, 30, and the wiring is performed so as to display the separation of the transmitter/receiver 11 of the master 10 from the main body by the display means 29, 39 simultaneously. Thereby, it is not required to prepare the line cable corresponding to the number of slaves 20, 30 when a large number of slaves 20, 30 are connected, and it is enough to prepare a common ground line, cables for display lamps 29, 39 and the one of a communication line, and the construction of the installation of an interphone can be remarkably simplified by reducing the cables used.